87' 4Runner Stumble

[gbftats]

I have an 87' 4Runner with a rebuild 22RE. It runs really good, except there is a stumble that happens when you slightly raise the RPM's past idle. After that trouble spot it goes back to running fine. Any ideas on what this could be?

 

[fourwd1]

Have you checked to see if any ECM error codes have been generated?

 

[Crawlin85]

check timing or MAF sensor might be sticking

 

[gbftats]

I will check those, thanks.